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    • 4. 发明申请
    • Method for manufacturing binders hardening by hydration and carbonation
    • WO2019072640A1
    • 2019-04-18
    • PCT/EP2018/076798
    • 2018-10-02
    • HEIDELBERGCEMENT AG
    • SKOCEK, JanZAJAC, MaciejBOLTE, GerdBEN HAHA, Mohsen
    • C04B7/345C04B28/18
    • Method for manufacturing a binder comprising a hydratable material and a building element from the binder comprising the steps: - providing a starting material from one or more raw materials convertible by tempering at 600 to 1200 °C into the hydratable material, wherein the starting material has a Ca/Si molar ratio from 0.5 to 1.8 and contains no or up to 30 % by weight of other elements than Ca and Si with regard to the total mass calculated as oxides, - tempering the starting material at a temperature in the range from 600 to 1200 °C during a residence time from 1 minutes to 5 hours to provide the hydratable material containing not more than 10 % by weight monocalcium silicate and at least 15 % by weight hydratable phases in the form of lime and dicalcium silicate, wherein at least 50 % of the hydratable phases are dicalcium silicate, wherein the residence time and the tempering temperature are adapted to obtain the said hydratable material by converting not more than 80 % by weight of the starting material, - cooling the hydratable material to provide the binder comprising the hydratable material. For manufacturing the building element the further steps of - mixing the binder with water and optionally one or more of aggregate, additves, admixtures to obtain a binder paste - placing the binder paste - hydrating the binder paste until the amount of bound water is at least 1 g/100 g dry binder and - carbonating the binder paste until until the amount of additionally bound carbon dioxide is at least 150 % of the initially bound water mass and/or the strength exceeds 2 MPa while still keeping the bound water at least 50 % of the initially bound water.